25642489 has 2 divisors, whose sum is σ = 25642490. Its totient is φ = 25642488.

The previous prime is 25642483. The next prime is 25642499. The reversal of 25642489 is 98424652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 5212089 = 4520^2 + 2283^2 .

It is a cyclic number.

It is not a de Polignac number, because 25642489 - 2¹⁹ = 25118201 is a prime.

It is not a weakly prime, because it can be changed into another prime (25642483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12821244 + 12821245.

It is an arithmetic number, because the mean of its divisors is an integer number (12821245).

Almost surely, 2^25642489 is an apocalyptic number.

It is an amenable number.

25642489 is a deficient number, since it is larger than the sum of its proper divisors (1).

25642489 is an equidigital number, since it uses as much as digits as its factorization.

25642489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 40.

The square root of 25642489 is about 5063.8413284778. The cubic root of 25642489 is about 294.8854826982.

The spelling of 25642489 in words is "twenty-five million, six hundred forty-two thousand, four hundred eighty-nine".